Mechanism for producing intermittent motion



March 3 I. J. LARSON 2,032,422

MECHANISM FOR PRODUCING INTERMITTENT MOTION Filed Jan. 2'7, 1954 lzvwswroza J1me J ARSON I by Arrow/5y .fPatented .1936 I im-r STAT-ES." PATENT amaze momma non. rnonnonm nvrnam'nm-nonon Iner J. Oaklyn, N. J.. l l lmu' toBadio' I Corporation of America, a corporation oi- Application January 21, m4, Serial lilo. 708,546 '5 Claims. wires- 18.4

V This invention relates to mechanisms for pro-; It will be hoted that a contact member such ducing intermittent motion, and has for its prinas a claw 20 attached to or forming a part of the oF lcE cipal object the provision of an improved intere mlttent motion mechanism which is simply an'd 7 ruggedly constructed-of comparativelydw parts and operates with a movement which is smooth and substantially continuousalonga predetereccentrics.

lever is arranged toengage the perforations ot a film 2| in its downward course past a motion picture aperture 22 and through a film gate in-- cluding the members 23 and 24 mounted on a support 25.

mined path. Atits lower end, this gate is curved for the Many of the mechanisms heretofore provid purpose of bringing the film into the path of the,

ed for imparting intermittent motion to a motion contact member 20. 10 plcturefilm, or the like, haveno'fibeen altogether As indicated in Figs. 2 and 3, this contact memsatisfactory for the reason that their operation her islfialntained in C nt t. with the film only involves abrupt changes in the movement of their for one-third of the time required for the memvarious parts and produces excessive wear and ""178! 20 to complete its cycle or movement. 'I'hus L objectionable vibrations. In accordance with the themember is engaged with the film in the 15 present invention, these difllculties are minized three positions indicated by Fig. 2 and is disor avoided by theprovision of a mechanism inengaged fro the film in the three positions eluding a pair of hinged arms .arrangedto be illustrated b Fig. 3. Due to the continuous rorotated at theiri'ree ends in a manner to cause ,tary movement oigts moving parts,'the mecha- 20 a contact member mounted at their junction to nism functions smdothly and without excessive 20 move-along a predetermined path including for wear oi its bearing surfaces. I a fraction of length the path of thefilm or other Having thus described my invention, I claim: member to be intermittently moved. 1. The combination of film path defining The inventionwill be better understood from' means, a pair of members similar in length 25 the following description when considered in" hinged together at one of their extreme ends and 25 connection with the accompanying drawing and providedwith a projecting member, and rotatable its scope will be pointed out 'in the appended crank means of similar throw. and direction of claims. I I rotation attachedto the other ends of said mem- Reierring to the drawing: bers for causing said projecting member to fol-i Fig. 1 is a perspective view of the improved lowa cycle or movement including said path. 30

mechanism, and f 2. The combination or film path defining Figs. 2 and 3 are explanatory diagrams. relatmeans, a pair of members similar in length ing to its operation. k A hinged together at one of their extreme ends and The device ofFig. 1 includes a pair of arms provided with a projectingrmember, and 'sepa- 36. or levers l0 and II n d r p v t d together, rate rotatable crank means or similanthrow and at the point I! and attached at the opposite ends direction of rotation attached to the other ends to pulleys II and I4.- These pulleys are mounted of said members for causing said projecting molnon shafts l5 and I6 and are driventhrough' a her to follow acycle of movement includingsaidgear train including a gear I'i mounted on the path.-

40'shait It, a gear ll mounted on the shaft it and, 3. The combination of film path defining 1 a main drive gear I! which meshes with the -means, a pair of members similar in length gears l1 and I8 and may be supplied. with drivhinged together at one of their-extreme ends and ing torque from any suitable source. Through provided with a projecting-member, rotatable this drive system eccentric motion isimparted crank means of similar throw and directional to the free ends oi. the levers. rotation attached to the other ends oisaid mem- 4,5

It will be apparent from the drawingthat the bers for causing said projecting member to to]- elements i3 and il are substantially identical low a cycle of movement-including said path, and as to size and also as to directionand speed of. a common means for similarly actuating 'said rotation. It will also be apparent that the arms. rotatable means. i

.or levers l0 and I l are of substantially the same 4. The combination of film path defining 50, length and are pivotedtogether attheir extreme means, a pair of members 01 similar length. ends. The elements '13 and I need not be hinged togetherv at one of their extreme'ends and cranked pulleys, as shown, but maybe any meprovided with -a projecting member, and means chanlcal equivalent thereof. such as cranks or for imparting'eccentric movements oi' similar I 56 1 radius and direction to the'other ends oi said u hmz members whereby said project-mg member is constrained to a cycle or movementincludin said path.

5. An intermittent feed mechanism comprising two eccentrics .of similar throw, means driving said eccentrics at the same speed and in the same direction; a, pair of members of substantielly the same length hinged together at one o their ends and having their other ends connected tothe-said eccentrics, means on said hinged end for engaging a film, and means for guiding a film through a portion of the path or said 5 film-engaging means.

INER JQLARsoN. 

